MLA
Robson, F. K. Portrait of John Brown. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 69. https://digital.library.emory.edu/purl/726xwdbrz6-cor.
APA, 6th edition
Robson, F. K. Portrait of John Brown (Box 69) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/726xwdbrz6-cor.
Chicago
Robson, F. K. “Portrait of John Brown.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 69. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/726xwdbrz6-cor.